to be adapted to patch
calls at alternative patching sites instead of paravirt calls.
Signed-off-by: Juergen Gross
Acked-by: Peter Zijlstra (Intel)
---
arch/x86/include/asm/alternative.h| 5 +++--
arch/x86/include/asm/paravirt.h | 9 ++---
arch/x86/include/asm/paravirt_types.h | 26
Now that paravirt is using the alternatives patching infrastructure,
remove the paravirt patching code.
Signed-off-by: Juergen Gross
Acked-by: Peter Zijlstra (Intel)
---
arch/x86/include/asm/paravirt.h | 18
arch/x86/include/asm/paravirt_types.h | 40
arch/x86
Introduce the macro ALT_NOT_XEN as a short form of
ALT_NOT(X86_FEATURE_XENPV).
Suggested-by: Peter Zijlstra (Intel)
Signed-off-by: Juergen Gross
---
V3:
- split off from next patch
---
arch/x86/include/asm/paravirt.h | 42 ---
arch/x86/include/asm/paravirt_types.h
bugs found by kernel test robot (patch 2)
Changes in V3:
- split v2 patch 3 into 2 patches as requested by Peter and Ingo
Changes in V2:
- split last patch into 2
- rebase of patch 2 as suggested by Peter
- addressed Peter's comments for patch 3
Juergen Gross (5):
x86/paravirt: move some
As a preparation for replacing paravirt patching completely by
alternative patching, move some backend functions and #defines to
alternative code and header.
Signed-off-by: Juergen Gross
---
V4:
- rename x86_nop() to nop_func() and x86_BUG() to BUG_func() (Boris
Petkov)
---
arch/x86/include
On 25.10.23 12:34, Borislav Petkov wrote:
On Thu, Oct 19, 2023 at 11:15:16AM +0200, Juergen Gross wrote:
+/* Low-level backend functions usable from alternative code replacements. */
+DEFINE_ASM_FUNC(x86_nop, "", .entry.text);
+EXPORT_SYMBOL_GPL(x86_nop);
This is all x86 code so
https://github.com/intel-lab-lkp/linux/commits/Juergen-Gross/x86-paravirt-move-some-functions-and-defines-to-alternative/20231019-171709
base: https://git.kernel.org/cgit/virt/kvm/kvm.git queue
patch link: https://lore.kernel.org/all/20231019091520.14540-5-jgr...@suse.com/
patch subject: [PATCH
On 25.10.23 15:44, Borislav Petkov wrote:
On Wed, Oct 25, 2023 at 03:31:07PM +0200, Juergen Gross wrote:
There is
#define nop() asm volatile ("nop")
in arch/x86/include/asm/special_insns.h already.
Then call it "nop_func" or so.
Okay.
It might not be needed now,
On 25.10.23 12:34, Borislav Petkov wrote:
On Thu, Oct 19, 2023 at 11:15:16AM +0200, Juergen Gross wrote:
+/* Low-level backend functions usable from alternative code replacements. */
+DEFINE_ASM_FUNC(x86_nop, "", .entry.text);
+EXPORT_SYMBOL_GPL(x86_nop);
This is all x86 code so
Now that paravirt is using the alternatives patching infrastructure,
remove the paravirt patching code.
Signed-off-by: Juergen Gross
Acked-by: Peter Zijlstra (Intel)
---
arch/x86/include/asm/paravirt.h | 18
arch/x86/include/asm/paravirt_types.h | 40
arch/x86
to be adapted to patch
calls at alternative patching sites instead of paravirt calls.
Signed-off-by: Juergen Gross
Acked-by: Peter Zijlstra (Intel)
---
arch/x86/include/asm/alternative.h| 5 +++--
arch/x86/include/asm/paravirt.h | 9 ++---
arch/x86/include/asm/paravirt_types.h | 26
Introduce the macro ALT_NOT_XEN as a short form of
ALT_NOT(X86_FEATURE_XENPV).
Suggested-by: Peter Zijlstra (Intel)
Signed-off-by: Juergen Gross
---
V3:
- split off from next patch
---
arch/x86/include/asm/paravirt.h | 42 ---
arch/x86/include/asm/paravirt_types.h
by Peter and Ingo
Changes in V2:
- split last patch into 2
- rebase of patch 2 as suggested by Peter
- addressed Peter's comments for patch 3
Juergen Gross (5):
x86/paravirt: move some functions and defines to alternative
x86/alternative: add indirect call patching
x86/paravirt: introduce
As a preparation for replacing paravirt patching completely by
alternative patching, move some backend functions and #defines to
alternative code and header.
Signed-off-by: Juergen Gross
Acked-by: Peter Zijlstra (Intel)
---
arch/x86/include/asm/alternative.h| 16
arch/x86
On 18.10.23 13:34, Ingo Molnar wrote:
* Juergen Gross wrote:
On 16.10.23 16:29, Peter Zijlstra wrote:
On Mon, Oct 16, 2023 at 02:39:32PM +0200, Juergen Gross wrote:
Instead of stacking alternative and paravirt patching, use the new
ALT_FLAG_CALL flag to switch those mixed calls to pure
On 16.10.23 16:29, Peter Zijlstra wrote:
On Mon, Oct 16, 2023 at 02:39:32PM +0200, Juergen Gross wrote:
Instead of stacking alternative and paravirt patching, use the new
ALT_FLAG_CALL flag to switch those mixed calls to pure alternative
handling.
This eliminates the need to be careful
Now that paravirt is using the alternatives patching infrastructure,
remove the paravirt patching code.
Signed-off-by: Juergen Gross
---
arch/x86/include/asm/paravirt.h | 18
arch/x86/include/asm/paravirt_types.h | 40
arch/x86/include/asm/text-patching.h | 12
to be adapted to patch
calls at alternative patching sites instead of paravirt calls.
Signed-off-by: Juergen Gross
---
arch/x86/include/asm/alternative.h| 5 +--
arch/x86/include/asm/paravirt.h | 49 +--
arch/x86/include/asm/paravirt_types.h | 29
As a preparation for replacing paravirt patching completely by
alternative patching, move some backend functions and #defines to
alternative code and header.
Signed-off-by: Juergen Gross
Acked-by: Peter Zijlstra (Intel)
---
arch/x86/include/asm/alternative.h| 16
arch/x86
as suggested by Peter
- addressed Peter's comments for patch 3
Juergen Gross (4):
x86/paravirt: move some functions and defines to alternative
x86/alternative: add indirect call patching
x86/paravirt: switch mixed paravirt/alternative calls to alternative_2
x86/paravirt: remove no longer
While backporting an upstream patch to one of our older distro kernels I've
found a weird locking hierarchy in the virtio crypto driver:
virtio_config_changed():
spin_lock_irqsave()
->__virtio_config_changed()
->drv->config_changed() <- assume drv == virtio_crypto_driver
On 20.09.23 16:52, Peter Zijlstra wrote:
On Thu, Jun 08, 2023 at 04:03:33PM +0200, Juergen Gross wrote:
Instead of stacking alternative and paravirt patching, use the new
ALT_FLAG_CALL flag to switch those mixed calls to pure alternative
handling.
This eliminates the need to be careful
On 13.09.23 15:26, Steven Rostedt wrote:
On Wed, 13 Sep 2023 13:38:27 +0200
Juergen Gross wrote:
diff --git a/include/trace/events/xen.h b/include/trace/events/xen.h
index 44a3f565264d..0577f0cdd231 100644
--- a/include/trace/events/xen.h
+++ b/include/trace/events/xen.h
@@ -6,26 +6,26
This small series is cleaning up Xen lazy mode handling by removing
unused stuff and moving purely Xen-specific code away from general
kernel code.
The last patch is fixing a regression which was introduced in the
6.6 merge window.
Juergen Gross (3):
arm/xen: remove lazy mode related
change.
Signed-off-by: Juergen Gross
---
arch/x86/include/asm/paravirt_types.h | 15 --
arch/x86/include/asm/xen/hypervisor.h | 26 +++
arch/x86/kernel/paravirt.c| 67 ---
arch/x86/xen/enlighten_pv.c | 39 +---
a
PING!
On 10.07.23 14:29, Juergen Gross wrote:
Any comments?
On 08.06.23 16:03, Juergen Gross wrote:
This is a small series getting rid of paravirt patching by switching
completely to alternative patching for the same functionality.
The basic idea is to add the capability to switch from
-by: kernel test robot
Closes:
https://lore.kernel.org/oe-kbuild-all/202307260332.pjntwr6o-...@intel.com/
Cc: Juergen Gross
Cc: Peter Zijlstra
Cc: Sami Tolvanen
Cc: Nathan Chancellor
Cc: Ajay Kaher
Cc: Alexey Makhalov
Cc: VMware PV-Drivers Reviewers
Cc: Thomas Gleixner
Cc: Ingo Molnar
Cc: Borislav
Any comments?
On 08.06.23 16:03, Juergen Gross wrote:
This is a small series getting rid of paravirt patching by switching
completely to alternative patching for the same functionality.
The basic idea is to add the capability to switch from indirect to
direct calls via a special alternative
On 10.06.23 07:43, Randy Dunlap wrote:
Clarify language. Clean up grammar. Hyphenate some words.
Change "low-ops" to "low-level" since "low-ops" isn't defined or even
mentioned anywhere else in the kernel source tree.
Signed-off-by: Randy Dunlap
Cc: Juergen Gro
On 09.06.23 11:45, Hou Wenlong wrote:
Similar to struct alt_instr, make the struct paravirt_patch_site packed
and get rid of all the .align directives. This could save 2 bytes for
one entry on X86_64.
Suggested-by: Nadav Amit
Signed-off-by: Hou Wenlong
Reviewed-by: Juergen Gross
Juergen
to be adapted to patch
calls at alternative patching sites instead of paravirt calls.
Remove the no longer needed paravirt patching and related code.
Signed-off-by: Juergen Gross
---
arch/x86/include/asm/alternative.h| 5 ++-
arch/x86/include/asm/paravirt.h | 27 +++
arch/x86
As a preparation for replacing paravirt patching completely by
alternative patching, move some backend functions and #defines to
alternative code and header.
Signed-off-by: Juergen Gross
---
arch/x86/include/asm/alternative.h| 16
arch/x86/include/asm/paravirt.h
tested the series on bare metal and as Xen PV domain to still
work.
RFC because I'm quite sure there will be some objtool work needed
(at least removing the specific paravirt handling).
Juergen Gross (3):
x86/paravirt: move some functions and defines to alternative
x86/alternative: add
relocation metadata on
relocatable builds. And the alignment could be hard coded to be 4 now.
Signed-off-by: Hou Wenlong
Cc: Thomas Garnier
Cc: Lai Jiangshan
Cc: Kees Cook
Reviewed-by: Juergen Gross
I think this patch should be taken even without the series.
Juergen
ravirt-ops.
Remove Srivatsa from the maintainers entry and add Ajay Kaher as an
additional reviewer for paravirt-ops. Also, add an entry to CREDITS
for Srivatsa.
Signed-off-by: Srivatsa S. Bhat (VMware)
Acked-by: Alexey Makhalov
Acked-by: Ajay Kaher
Acked-by: Juergen Gross
expectedly zeroed registers at the call site of the
related paravirt functions.
Replace the C functions with DEFINE_PARAVIRT_ASM() constructs using
the same instructions as the related paravirt calls in the
PVOP_ALT_[V]CALLEE*() macros.
Signed-off-by: Juergen Gross
---
V2:
- use noinstr sect
On 16.03.23 21:14, Peter Zijlstra wrote:
On Wed, Mar 08, 2023 at 04:42:10PM +0100, Juergen Gross wrote:
+DEFINE_PARAVIRT_ASM(pv_native_irq_disable, "cli", .text);
+DEFINE_PARAVIRT_ASM(pv_native_irq_enable, "sti", .text);
+DEFINE_PARAVIRT_ASM(pv_native_read_cr2, "mov %
On 09.03.23 14:39, Borislav Petkov wrote:
On Wed, Mar 08, 2023 at 04:42:10PM +0100, Juergen Gross wrote:
All functions referenced via __PV_IS_CALLEE_SAVE() need to be assembler
functions, as those functions calls are hidden from gcc. In case the
kernel is compiled with "-fzero-call-used
expectedly zeroed registers at the call site of the
related paravirt functions.
Replace the C functions with DEFINE_PARAVIRT_ASM() constructs using
the same instructions as the related paravirt calls in the
PVOP_ALT_[V]CALLEE*() macros.
Signed-off-by: Juergen Gross
---
arch/x86/i
On 07.02.23 22:09, Srivatsa S. Bhat wrote:
On 2/6/23 11:59 PM, Juergen Gross wrote:
The two paravirt callbacks .mmu.activate_mm and .mmu.dup_mmap are
sharing the same implementations in all cases: for Xen PV guests they
are pinning the PGD of the new mm_struct, and for all other cases
-off-by: Juergen Gross
Reviewed-by: Boris Ostrovsky
---
V2:
- expand commit message (Srivatsa S. Bhat)
---
arch/x86/include/asm/mmu_context.h| 4 ++--
arch/x86/include/asm/paravirt.h | 14 +++---
arch/x86/include/asm/paravirt_types.h | 7 ++-
arch/x86/kernel/paravirt.c
el J. Wysocki"
Cc: "Paul E. McKenney"
Cc: Wyes Karny
Cc: Lewis Caroll
Cc: Tom Lendacky
Cc: Alexey Makhalov
Cc: Juergen Gross
Cc: x...@kernel.org
Cc: VMware PV-Drivers Reviewers
Cc: virtualization@lists.linux-foundation.org
Cc: k...@vger.kernel.org
Cc: xen-de...@lists.xen
On 16.01.23 05:27, Srivatsa S. Bhat wrote:
Hi Juergen,
On 1/12/23 7:21 AM, Juergen Gross wrote:
The two paravirt callbacks .mmu.activate_mm and .mmu.dup_mmap are
sharing the same implementations in all cases: for Xen PV guests they
are pinning the PGD of the new mm_struct, and for all other
to the
corresponding already existing .mmu.exit_mmap).
As the first parameter of the old callbacks isn't used, drop it from
the replacement one.
Signed-off-by: Juergen Gross
---
arch/x86/include/asm/mmu_context.h| 4 ++--
arch/x86/include/asm/paravirt.h | 14 +++---
arch/x86/include/asm
relocation metadata on
relocatable builds. And the alignment could be hard coded to be 4 now.
Signed-off-by: Hou Wenlong
Reviewed-by: Juergen Gross
Juergen
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On 24.11.22 12:06, Hou Wenlong wrote:
On Thu, Nov 24, 2022 at 11:18:52AM +0100, Juergen Gross wrote:
On 24.11.22 09:51, Hou Wenlong wrote:
Similar to the alternative patching, use relative reference for original
instruction rather than absolute one, which saves 8 bytes for one entry
on x86_64
On 24.11.22 09:51, Hou Wenlong wrote:
Similar to the alternative patching, use relative reference for original
instruction rather than absolute one, which saves 8 bytes for one entry
on x86_64. And it could generate R_X86_64_PC32 relocation instead of
8 bytes saved? I think those are 4 bytes
On 16.11.22 12:04, Peter Zijlstra wrote:
On Wed, Nov 09, 2022 at 02:44:18PM +0100, Juergen Gross wrote:
There are some paravirt assembler functions which are sharing a common
pattern. Introduce a macro DEFINE_PARAVIRT_ASM() for creating them.
Note that this macro is including explicit
() and paravirt_ret0() to be aligned at 4 byte boundaries
now.
The explicit _paravirt_nop() prototype in paravirt.c isn't needed, as
it is included in paravirt_types.h already.
Signed-off-by: Juergen Gross
Reviewed-by: Srivatsa S. Bhat (VMware)
---
V2:
- expanded commit message (Srivatsa S. Bhat
On 09.11.22 06:16, Srivatsa S. Bhat wrote:
Hi Juergen,
Sorry for the delay in reviewing this patch!
On 10/20/22 2:19 AM, Juergen Gross wrote:
There are some paravirt assembler functions which are sharing a common
pattern. Introduce a macro DEFINE_PARAVIRT_ASM() for creating them
Ping?
On 20.10.22 11:19, Juergen Gross wrote:
There are some paravirt assembler functions which are sharing a common
pattern. Introduce a macro DEFINE_PARAVIRT_ASM() for creating them.
The explicit _paravirt_nop() prototype in paravirt.c isn't needed, as
it is included in paravirt_types.h
On 03.11.22 14:58, johnnyaiai wrote:
Thanks for reply! I think nopvspin parameters controls
pvspinlock or native spinlock. a vm guest always running
on virtspin wheather nopvspin sets or not when EXITS_HALT
not supported by hypervisor. So provide a missing parameter
'novirtspin'.
Your patch is
On 03.11.22 13:13, johnnyaiai wrote:
From: johnnyaiai
virt_spin_lock() is preferred over native qspinlock when
vCPU is preempted. But brings a lot of regression while
vCPU is not preempted. Provide a early param 'novirtlock'
to choose would be better.
will-it-scale/lock2_threads -s 10 -t 64
There are some paravirt assembler functions which are sharing a common
pattern. Introduce a macro DEFINE_PARAVIRT_ASM() for creating them.
The explicit _paravirt_nop() prototype in paravirt.c isn't needed, as
it is included in paravirt_types.h already.
Signed-off-by: Juergen Gross
---
arch/x86
On 23.09.22 09:05, Peter Zijlstra wrote:
On Thu, Jul 21, 2022 at 01:44:33PM -0700, Srivatsa S. Bhat wrote:
From: Srivatsa S. Bhat (VMware)
VMware ESXi allows enabling a passthru mwait CPU-idle state in the
guest using the following VMX option:
monitor_control.mwait_in_guest = "TRUE"
This
: call to
HYPERVISOR_sched_op.constprop.0() leaves .noinstr.text section
Signed-off-by: Peter Zijlstra (Intel)
Reviewed-by: Srivatsa S. Bhat (VMware)
Reviewed-by: Juergen Gross
Juergen
OpenPGP_0xB0DE9DD628BF132F.asc
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Description: OpenPGP
Signed-off-by: Liang He
Co-developed-by: Kelin Wang
Signed-off-by: Kelin Wang
Reviewed-by: Juergen Gross
Juergen
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___
Virt
Signed-off-by: Liang He
Signed-off-by: Kelin Wang
Reviewed-by: Juergen Gross
Juergen
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___
Virtualization mailing list
Virt
along.
Link: https://github.com/KSPP/linux/issues/192
Cc: Kees Cook
Cc: Nick Desaulniers
Cc: Juergen Gross
Cc: "Srivatsa S. Bhat (VMware)"
Cc: Alexey Makhalov
Cc: Thomas Gleixner
Cc: Ingo Molnar
Cc: Borislav Petkov
Cc: Dave Hansen
Cc: "H. Peter Anvin"
Cc: VMware PV-Driv
d CLBR_* macros.
Cc: Juergen Gross
Cc: "Srivatsa S. Bhat (VMware)"
Cc: Alexey Makhalov
Cc: VMware PV-Drivers Reviewers
Cc: Thomas Gleixner
Cc: Ingo Molnar
Cc: Borislav Petkov
Cc: Dave Hansen
Cc: x...@kernel.org
Cc: "H. Peter Anvin"
Cc: Bill Wendling
Cc: virtualizati
On 31.08.22 17:37, Dmitry Osipenko wrote:
Prepare gntdev driver to the common dynamic dma-buf locking convention
by starting to use the unlocked versions of dma-buf API functions.
Signed-off-by: Dmitry Osipenko
Acked-by: Juergen Gross
Juergen
OpenPGP_0xB0DE9DD628BF132F.asc
Description
On 22.06.22 08:38, Juergen Gross wrote:
Instead of an all or nothing approach add support for requiring
restricted memory access per device.
Changes in V3:
- new patches 1 + 2
- basically complete rework of patch 3
Juergen Gross (3):
virtio: replace restricted mem access flag with callback
6.2
System Benchmarks Index Score8157.8
Signed-off-by: Guo Hui
Reviewed-by: Juergen Gross
Juergen
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On 27.06.22 04:13, Guo Hui wrote:
The instructions assigned to the vcpu_is_preempted function parameter
in the X86 architecture physical machine are redundant instructions,
causing the multi-core performance of Unixbench to drop by about 4% to 5%.
The C function is as follows:
static bool
Instead of an all or nothing approach add support for requiring
restricted memory access per device.
Changes in V3:
- new patches 1 + 2
- basically complete rework of patch 3
Juergen Gross (3):
virtio: replace restricted mem access flag with callback
kernel: remove platform_has
a callback always returning false.
As the callback needs to be set in early init code already, add a
virtio anchor which is builtin in case virtio is enabled.
Signed-off-by: Juergen Gross
---
arch/s390/mm/init.c | 4 ++--
arch/x86/mm/mem_encrypt_amd.c| 4 ++--
drivers/virtio/Kconfig
On 02.06.22 21:23, Oleksandr Tyshchenko wrote:
From: Oleksandr Tyshchenko
Hello all.
The purpose of this patch series is to add support for restricting memory
access under Xen using specific
grant table [1] based DMA-mapping layer. Patch series is based on Juergen
Gross’ initial work [2
On 04.05.22 17:57, Juergen Gross wrote:
Instead of using arch_has_restricted_virtio_memory_access() together
with CONFIG_ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS, replace those
with platform_has() and a new platform feature
PLATFORM_VIRTIO_RESTRICTED_MEM_ACCESS.
Signed-off-by: Juergen Gross
.
The platform_has() function is using a simple test_bit() call for now,
further optimization might be added when needed.
[1]:
https://lore.kernel.org/lkml/1650646263-22047-1-git-send-email-olekst...@gmail.com/T/#t
Juergen Gross (2):
kernel: add platform_has() infrastructure
virtio: replace
Add a simple infrastructure for setting, resetting and querying
platform feature flags.
Flags can be either global or architecture specific.
Signed-off-by: Juergen Gross
---
V2:
- rename set/reset functions to platform_[set|clear]() (Boris Petkov,
Heiko Carstens)
- move function
Instead of using arch_has_restricted_virtio_memory_access() together
with CONFIG_ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS, replace those
with platform_has() and a new platform feature
PLATFORM_VIRTIO_RESTRICTED_MEM_ACCESS.
Signed-off-by: Juergen Gross
---
V2:
- move setting
nline")
Cc: sta...@vger.kernel.org
Signed-off-by: Prakruthi Deepak Heragu
Signed-off-by: Elliot Berman
Reviewed-by: Juergen Gross
Juergen
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On 04.05.22 11:45, Will Deacon wrote:
On Thu, Apr 28, 2022 at 11:35:36AM -0700, Elliot Berman wrote:
From: Prakruthi Deepak Heragu
During hotplug, the stolen time data structure is unmapped and memset.
There is a possibility of the timer IRQ being triggered before memset
and stolen time is
On 27.04.22 18:30, Michael Kelley (LINUX) wrote:
From: Juergen Gross Sent: Wednesday, April 27, 2022 8:34 AM
Instead of using arch_has_restricted_virtio_memory_access() together
with CONFIG_ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS, replace those
with platform_has() and a new platform feature
Add a simple infrastructure for setting, resetting and querying
platform feature flags.
Flags can be either global or architecture specific.
Signed-off-by: Juergen Gross
---
V2:
- rename set/reset functions to platform_[set|clear]() (Boris Petkov,
Heiko Carstens)
- move function
.
The platform_has() function is using a simple test_bit() call for now,
further optimization might be added when needed.
[1]:
https://lore.kernel.org/lkml/1650646263-22047-1-git-send-email-olekst...@gmail.com/T/#t
Juergen Gross (2):
kernel: add platform_has() infrastructure
virtio: replace
Instead of using arch_has_restricted_virtio_memory_access() together
with CONFIG_ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS, replace those
with platform_has() and a new platform feature
PLATFORM_VIRTIO_RESTRICTED_MEM_ACCESS.
Signed-off-by: Juergen Gross
---
V2:
- move setting
On 27.04.22 16:09, Tom Lendacky wrote:
On 4/27/22 07:37, Juergen Gross wrote:
On 27.04.22 14:28, Borislav Petkov wrote:
On Wed, Apr 27, 2022 at 08:37:31AM +0200, Juergen Gross wrote:
On 26.04.22 19:35, Borislav Petkov wrote:
On Tue, Apr 26, 2022 at 03:40:21PM +0200, Juergen Gross wrote
On 27.04.22 14:26, Borislav Petkov wrote:
On Wed, Apr 27, 2022 at 08:40:08AM +0200, Juergen Gross wrote:
I was planning to look at the x86 cpu features to see whether some of
those might be candidates to be switched to platform features instead.
I'd say "never touch a running system&qu
On 27.04.22 14:28, Borislav Petkov wrote:
On Wed, Apr 27, 2022 at 08:37:31AM +0200, Juergen Gross wrote:
On 26.04.22 19:35, Borislav Petkov wrote:
On Tue, Apr 26, 2022 at 03:40:21PM +0200, Juergen Gross wrote:
/* protected virtualization */
static void pv_init(void
On 26.04.22 21:51, Heiko Carstens wrote:
On Tue, Apr 26, 2022 at 07:35:43PM +0200, Borislav Petkov wrote:
On Tue, Apr 26, 2022 at 03:40:21PM +0200, Juergen Gross wrote:
/* protected virtualization */
static void pv_init(void)
{
if (!is_prot_virt_guest())
return
On 26.04.22 19:35, Borislav Petkov wrote:
On Tue, Apr 26, 2022 at 03:40:21PM +0200, Juergen Gross wrote:
/* protected virtualization */
static void pv_init(void)
{
if (!is_prot_virt_guest())
return;
+ platform_set_feature(PLATFORM_VIRTIO_RESTRICTED_MEM_ACCESS
On 26.04.22 19:31, Borislav Petkov wrote:
On Tue, Apr 26, 2022 at 03:40:20PM +0200, Juergen Gross wrote:
diff --git a/kernel/platform-feature.c b/kernel/platform-feature.c
new file mode 100644
index ..2d52f8442cd5
--- /dev/null
+++ b/kernel/platform-feature.c
@@ -0,0 +1,7
.
The platform_has() function is using a simple test_bit() call for now,
further optimization might be added when needed.
[1]:
https://lore.kernel.org/lkml/1650646263-22047-1-git-send-email-olekst...@gmail.com/T/#t
Juergen Gross (2):
kernel: add platform_has() infrastructure
virtio: replace
Instead of using arch_has_restricted_virtio_memory_access() together
with CONFIG_ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS, replace those
with platform_has() and a new platform feature
PLATFORM_VIRTIO_RESTRICTED_MEM_ACCESS.
Signed-off-by: Juergen Gross
---
I've only done a compile test on x86
Add a simple infrastructure for setting, resetting and querying
platform feature flags.
Flags can be either global or architecture specific.
Signed-off-by: Juergen Gross
---
MAINTAINERS| 8 +++
include/asm-generic/Kbuild | 1 +
include/asm-generic
crash, but are
you sure that para_steal_clock() can't be called from another cpu
concurrently?
In case you verified this can't happen, you can add my:
Reviewed-by: Juergen Gross
Otherwise you either need to use RCU for doing the memunmap(), or a
lock to protect stolen_time_region.
Juergen
On 07.03.22 11:38, Peter Zijlstra wrote:
On Mon, Mar 07, 2022 at 11:06:46AM +0100, Juergen Gross wrote:
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index 4420499f7bb4..a1f179ed39bf 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -145,6
On 07.03.22 10:50, Peter Zijlstra wrote:
On Fri, Mar 04, 2022 at 08:27:45PM +0200, Adrian Hunter wrote:
On 04/03/2022 15:41, Peter Zijlstra wrote:
On Mon, Feb 14, 2022 at 01:09:06PM +0200, Adrian Hunter wrote:
Currently, when Intel PT is used within a VM guest, it is not possible to
make use
On 23.11.21 10:52, Juergen Gross via Virtualization wrote:
On 23.11.21 10:29, Jan Beulich wrote:
On 05.10.2021 09:43, Juergen Gross wrote:
On 30.09.21 14:40, Jan Beulich via Virtualization wrote:
While using a plain (constant) address works, its use needlessly
invokes
a SIB addressing mode
On 23.11.21 10:29, Jan Beulich wrote:
On 05.10.2021 09:43, Juergen Gross wrote:
On 30.09.21 14:40, Jan Beulich via Virtualization wrote:
While using a plain (constant) address works, its use needlessly invokes
a SIB addressing mode, making every call site one byte larger than
necessary
access like open mailing lists, which makes them more like email
aliases instead (to reach out to reviewers).
So update all the VMware mailing list references in the MAINTAINERS
file to mark them as such, using "R: email-al...@vmware.com".
Signed-off-by: Srivatsa S. Bhat (VMware)
Acked-b
On 08.11.21 21:30, Srivatsa S. Bhat wrote:
From: Srivatsa S. Bhat (VMware)
VMware mailing lists in the MAINTAINERS file are private lists meant
for VMware-internal review/notification for patches to the respective
subsystems. So, in an earlier discussion [1][2], it was recommended to
mark them
this change.
Signed-off-by: Srivatsa S. Bhat (VMware)
Acked-by: Alexey Makhalov
Acked-by: Deep Shah
Cc: sta...@vger.kernel.org
Acked-by: Juergen Gross
Juergen
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A recent patch modifying the core paravirt-ops functionality is
highlighting some missing MAINTAINERS information for PARAVIRT_OPS:
there is no information which tree is to be used for taking those
patches per default. In the past this was mostly handled by the tip
tree, and I think this is fine.
.
Signed-off-by: Juergen Gross
Acked-by: Peter Zijlstra (Intel)
Reviewed-by: Boris Ostrovsky
---
V3:
- make paravirt_BUG() noinstr
---
arch/x86/include/asm/paravirt_types.h | 2 +
arch/x86/kernel/paravirt.c| 13 +-
arch/x86/xen/enlighten.c | 19 +
arch/x86/xen
The pvops function for Xen PV guests handling the interrupt flag are
much more complex than needed.
With the supported Xen hypervisor versions they can be simplified a
lot, especially by removing the need for disabling preemption.
Juergen Gross (2):
x86/xen: remove xen_have_vcpu_info_placement
Signed-off-by: Jan Beulich
Reviewed-by: Juergen Gross
Juergen
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Virtualization@lists.linux-
On 22.09.21 23:49, Boris Ostrovsky wrote:
On 9/22/21 6:31 AM, Juergen Gross wrote:
The initial pvops functions handling irq flags will only ever be called
before interrupts are being enabled.
So make the __init and switch them to be dummy functions:
What are you making __init?
Oh, sorry
for that purpose.
Signed-off-by: Juergen Gross
---
arch/x86/include/asm/paravirt_types.h | 2 +
arch/x86/kernel/paravirt.c| 13 +-
arch/x86/xen/enlighten.c | 19 +
arch/x86/xen/irq.c| 61 ++-
4 files changed, 20
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